Yes create some positive news about yourself or create a website about yourself and start getting some good reviews about yourself.Encourage friends to leave positive remarks about you.
You could hire a lawyer and send her a legal letter for defamation of character and tell her to remove it or be taken to court.
Just get the letter sent to her and she does not have to know that you do not have proof. But if needed the lawyer could get a court order for the website to release the records of whos account it is and with that is your proof.
LOL LOL LOL!!
Someone's posted stuff about you on cheaterville? xDD!